Compressed package password cracking sample share of similar code cracking

Yesterday turned over the hard drive, found a good thing, but he added the password he did not remember. Tried a few common did not try out, so wrote such a small script for me to try. Well, that's a real solution.
The python script reads as follows, and it's not bad to run your own encrypted zip

# -*- coding: utf-8 -*-

import sys,os

def IsElementUniq(list):
    """
           judge list Is the element of 
    """
    for word in list:
        if list.count(word)>1:
            return False

    return True

def GenPswList():
    """
           Ask the user to enter a word, and combine the password according to the word, try only four words to combine, and limit the password length to 20 . The writing is rather poor 
    """
    psw=raw_input('input a word>')
    wordlist = []
    while psw:
        wordlist.append(psw)
        psw=raw_input('input a word>')
    print wordlist

    global g_pswlist
    g_pswlist = []
    for word in wordlist:
        g_pswlist.append(word)

    for word1 in wordlist:
        for word2 in wordlist:
            locallist = [word1, word2]
            if IsElementUniq(locallist):
                tmp = word1 + word2
                if len(tmp) < 20:
                    g_pswlist.append(tmp)

    for word1 in wordlist:
        for word2 in wordlist:
            for word3 in wordlist:
                locallist = [word1, word2, word3]
                if IsElementUniq(locallist):
                    tmp = word1 + word2 + word3
                    if len(tmp) < 20:
                        g_pswlist.append(tmp)

    for word1 in wordlist:
        for word2 in wordlist:
            for word3 in wordlist:
                for word4 in wordlist:
                    locallist = [word1, word2, word3, word4]
                    if IsElementUniq(locallist):
                        tmp = word1 + word2 + word3 + word4
                        if len(tmp) < 20:
                            g_pswlist.append(tmp)

    print 'gen psw is:', g_pswlist

def TestUnZipPack(filename):
    """
           Try unzipping a zip with a password 
    """

    command = ""
    for psw in g_pswlist:
        command = "7z e -p%s -y %s" %(psw,filename)
        print command
        ret = os.system(command)
        if ret == 0:
            print 'right psw is ', psw
            break

def main(filename):
    GenPswList()
    TestUnZipPack(filename)

if __name__ == '__main__':
    if len(sys.argv) != 2:
        print 'argv error'
        print 'example:test_7z_psw.py 1.7z'
        sys.exit(1)

    main(sys.argv[1])